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<h2>Custom Output Formats</h2>
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<div class="navigation"><a href="/glyph/book/extending/task.html">Defining Custom Tasks ←</a><a href="/glyph/book/index.html">Contents</a><a href="/glyph/book/extending/command.html">→ Defining Custom Commands</a></div>
<p>As shown in <a href="/glyph/book/extending/commands_tasks.html#cmd_tasks_arch">How Commands and Tasks work</a>, the <a href="/glyph/book/ref_commands.html#c_compile"><code>compile</code></a> command command calls specific tasks defined in the <code>generate:</code> Rake namespace to generate output files in a particular format.</p>
<p>More specifically, when a <code>--format</code> option is specified, the command looks for a task with the same name within the <code>generate:</code> namespace. This makes adding new output formats to Glyph a fairly easy task, without the need to specify custom commands or similar.</p>
<p>The following sections explain how the <code>h3rald</code> output format was created to integrate this book into the <a href="http://www.h3rald.com">H3RALD.com</a> website.</p>
<div class="section">
<h6 id="h_93">Output Configuration</h6>
<p>The first step required to add a new output format to Glyph is extending Glyph’s configuration by adding the appropriate output hash, as follows:</p>
<pre class="lazy"><span class="line-numbers"> 1 </span> :<span class="MetaTag"><span class="MetaTag">output</span><span class="MetaTag">:</span> </span>
<span class="line-numbers"> 2 </span> :<span class="MetaTag"><span class="MetaTag">h3rald</span><span class="MetaTag">:</span> </span>
<span class="line-numbers"> 3 </span> :<span class="String"><span class="Entity">multifile<span class="Entity">:</span></span> <span class="String">true</span></span>
<span class="line-numbers"> 4 </span> :<span class="MetaTag"><span class="MetaTag">extension</span><span class="MetaTag">:</span> </span><span class="String"><span class="String">'</span>.html<span class="String">'</span></span>
<span class="line-numbers"> 5 </span> :<span class="MetaTag"><span class="MetaTag">filter_target</span><span class="MetaTag">:</span> </span><span class="String"><span class="String">'</span>html<span class="String">'</span></span>
<span class="line-numbers"> 6 </span> :<span class="MetaTag"><span class="MetaTag">base</span><span class="MetaTag">:</span> </span><span class="String"><span class="String">'</span>/glyph/book/<span class="String">'</span></span>
<span class="line-numbers"> 7 </span> :<span class="MetaTag"><span class="MetaTag">macro_dirs</span><span class="MetaTag">:</span> </span>[<span class="String"><span class="String">'</span>html<span class="String">'</span></span>]
<span class="line-numbers"> 8 </span> :<span class="MetaTag"><span class="MetaTag">layout_dirs</span><span class="MetaTag">:</span> </span>[<span class="String"><span class="String">'</span>web<span class="String">'</span></span>]
<span class="line-numbers"> 9 </span> :<span class="MetaTag"><span class="MetaTag">layouts</span><span class="MetaTag">:</span> </span>
<span class="line-numbers"> 10 </span> :<span class="String"><span class="Entity">topic<span class="Entity">:</span></span> <span class="String">bookpage</span></span>
<span class="line-numbers"> 11 </span> :<span class="String"><span class="Entity">index<span class="Entity">:</span></span> <span class="String">bookindex</span></span>
</pre>
<p>In particular, the following keys are mandatory:</p>
<ul>
<li>multifile</li>
<li>extension</li>
<li>filter_target</li>
<li>base</li>
<li>macro_dirs</li>
<li>layout_dirs</li>
</ul>
</div>
<div class="section">
<h6 id="h_94">Creating a 'generate:h3rald' task</h6>
<p>The next (and final) step involves creating a custom <code>h3rald</code> task within the <code>generate:</code> namespace. This task can be placed in any <code>.rake</code> file within the <code>lib/tasks</code> directory:</p>
<pre class="lazy"><span class="line-numbers"> 1 </span> namespace <span class="Constant"><span class="Constant">:</span>generate</span> <span class="Keyword">do</span>
<span class="line-numbers"> 2 </span> desc <span class="String"><span class="String">"</span>Create output for h3rald.com integration<span class="String">"</span></span>
<span class="line-numbers"> 3 </span> task <span class="Constant"><span class="Constant">:</span>h3rald</span> => [<span class="Constant"><span class="Constant">:</span>web</span>] <span class="Keyword">do</span>
<span class="line-numbers"> 4 </span> dir <span class="Keyword">=</span> <span class="Support">Glyph</span>::<span class="Entity">PROJECT</span><span class="Keyword">/</span><span class="String"><span class="String">'</span>output/h3rald<span class="String">'</span></span>
<span class="line-numbers"> 5 </span> (dir<span class="Keyword">/</span><span class="String"><span class="String">"</span>glyph/book<span class="String">"</span></span>).<span class="Entity">mkpath</span>
<span class="line-numbers"> 6 </span> <span class="Comment"> <span class="Comment">#</span> Copy files in subdir</span>
<span class="line-numbers"> 7 </span> (dir).<span class="Entity">find</span> <span class="Keyword">do </span>|<span class="Variable">i</span>|
<span class="line-numbers"> 8 </span> <span class="Keyword">if</span> i.<span class="Entity">file?</span> <span class="Keyword">then</span>
<span class="line-numbers"> 9 </span> <span class="Keyword">next</span> <span class="Keyword">if</span>
<span class="line-numbers"> 10 </span> i.<span class="Entity">to_s</span>.<span class="Entity">match</span>(<span class="Support">Regexp</span>.<span class="Entity">escape</span>(dir<span class="Keyword">/</span><span class="String"><span class="String">'</span>glyph<span class="String">'</span></span>)) <span class="Keyword">||</span>
<span class="line-numbers"> 11 </span> i.<span class="Entity">to_s</span>.<span class="Entity">match</span>(<span class="Support">Regexp</span>.<span class="Entity">escape</span>(dir<span class="Keyword">/</span><span class="String"><span class="String">'</span>images<span class="String">'</span></span>)) <span class="Keyword">||</span>
<span class="line-numbers"> 12 </span> i.<span class="Entity">to_s</span>.<span class="Entity">match</span>(<span class="Support">Regexp</span>.<span class="Entity">escape</span>(dir<span class="Keyword">/</span><span class="String"><span class="String">'</span>styles<span class="String">'</span></span>))
<span class="line-numbers"> 13 </span> dest <span class="Keyword">=</span> dir<span class="Keyword">/</span><span class="String"><span class="String">"</span>glyph/book/<span class="String"><span class="String">#{</span>i<span class="String"><span class="String">.</span><span class="Entity">relative_path_from</span></span><span class="String">(</span><span class="Support">Glyph</span><span class="String"><span class="String">::</span><span class="Entity">PROJECT</span></span><span class="Keyword">/</span>dir<span class="String">)</span><span class="String">}</span></span><span class="String">"</span></span>
<span class="line-numbers"> 14 </span> src <span class="Keyword">=</span> i.<span class="Entity">to_s</span>
<span class="line-numbers"> 15 </span> <span class="Support">Pathname</span>.<span class="Entity">new</span>(dest).<span class="Entity">parent</span>.<span class="Entity">mkpath</span>
<span class="line-numbers"> 16 </span> file_copy src, dest
<span class="line-numbers"> 17 </span> <span class="Keyword">end</span>
<span class="line-numbers"> 18 </span> <span class="Keyword">end</span>
<span class="line-numbers"> 19 </span> <span class="Comment"> <span class="Comment">#</span> Remove files</span>
<span class="line-numbers"> 20 </span> dir.<span class="Entity">children</span>.<span class="Entity">each</span> <span class="Keyword">do </span>|<span class="Variable">c</span>|
<span class="line-numbers"> 21 </span> <span class="Keyword">unless</span> [dir<span class="Keyword">/</span><span class="String"><span class="String">'</span>glyph<span class="String">'</span></span>, dir<span class="Keyword">/</span><span class="String"><span class="String">'</span>images<span class="String">'</span></span>, dir<span class="Keyword">/</span><span class="String"><span class="String">'</span>styles<span class="String">'</span></span>].<span class="Entity">include?</span> c <span class="Keyword">then</span>
<span class="line-numbers"> 22 </span> c.<span class="Entity">directory?</span> <span class="Keyword">?</span> c.<span class="Entity">rmtree</span> : c.<span class="Entity">unlink</span>
<span class="line-numbers"> 23 </span> <span class="Keyword">end</span>
<span class="line-numbers"> 24 </span> <span class="Keyword">end</span>
<span class="line-numbers"> 25 </span> (dir<span class="Keyword">/</span><span class="String"><span class="String">'</span>images/glyph/glyph.eps<span class="String">'</span></span>).<span class="Entity">unlink</span>
<span class="line-numbers"> 26 </span> (dir<span class="Keyword">/</span><span class="String"><span class="String">'</span>images/glyph/glyph.svg<span class="String">'</span></span>).<span class="Entity">unlink</span>
<span class="line-numbers"> 27 </span> <span class="Comment"> <span class="Comment">#</span> Create project page</span>
<span class="line-numbers"> 28 </span> project <span class="Keyword">=</span> <span class="Support">Glyph</span>.<span class="Entity">filter</span> <span class="String"><span class="String">%{</span>layout:project[</span>
<span class="line-numbers"> 29 </span> <span class="String"> @contents[<span class="String"><span class="String">#{</span><span class="String"><span class="Entity">file_load</span></span><span class="String">(</span><span class="Support">Glyph</span><span class="String"><span class="String">::</span><span class="Entity">PROJECT</span></span><span class="Keyword">/</span><span class="String"><span class="String">'</span>text/introduction.glyph<span class="String">'</span></span><span class="String">)</span><span class="String">}</span></span>]</span>
<span class="line-numbers"> 30 </span> <span class="String"> ]<span class="String">}</span></span>
<span class="line-numbers"> 31 </span> file_write dir<span class="Keyword">/</span><span class="String"><span class="String">"</span>glyph.textile<span class="String">"</span></span>, project
<span class="line-numbers"> 32 </span> <span class="Keyword">end</span>
<span class="line-numbers"> 33 </span> <span class="Keyword">end</span>
</pre>
<p>In this case, this task does not actually renders files in a different format, it just moves the files generated by the @generate:web@ task in different subdirectories.</p>
<p>Additionally, it also generates the <a href="http://www.h3rald.com/glyph/">Glyph project page</a> from the book's introduction (note the usage of a raw custom layout macro).</p>
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<div class="navigation"><a href="/glyph/book/extending/task.html">Defining Custom Tasks ←</a><a href="/glyph/book/index.html">Contents</a><a href="/glyph/book/extending/command.html">→ Defining Custom Commands</a></div>
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